Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 7308966 | Device for reducing jet engine exhaust noise using oscillating jets A device for reducing engine exhaust noise in an aircraft engine includes a number of oscillating jets which direct an oscillating flow into the engine exhaust. The oscillating jets are connected via channels to a turbomachinery source of high pressure gas, where th... | 12/18/2007 |
| 7293401 | Jet engine noise suppressor An embodiment of the invention is a technique to suppress noise in a jet engine. A noise suppressor includes an exhaust duct to exhaust a first stream from an air stream taken from an inlet. The exhaust duct has an exit end. The air stream is divided into the first ... | 11/13/2007 |
| 7055329 | Method and apparatus for noise attenuation for gas turbine engines using at least one synthetic jet actuator for injecting air A method enables a gas turbine engine to be operated. The method comprises channeling exhaust gases from a core engine through an exhaust assembly and past at least one flow boundary surface, and selectively operating a noise suppression system extending from the at... | 06/06/2006 |
| 7051523 | Exhaust system assemblies employing wire bushings for thermal compensation Exhaust system assemblies employ wire bushings for thermal compensation to minimize noise due to “stick-slip” while the system cools. In a preferred embodiment, the wire bushings are formed of at least one strand of wire coiled about male end portions of pipe se... | 05/30/2006 |
| 7043898 | Combined exhaust duct and mixer for a gas turbine engine A gas turbine engine including a gas exhaust duct assembly which comprises an annular shroud forming at least a section of an inner wall of a gas exhaust duct, a plurality of strut members radially projecting from the shroud, and a plurality of insert members. The s... | 05/16/2006 |
| 7010905 | Ventilated confluent exhaust nozzle An exhaust nozzle includes an outer duct surrounding an inner duct. The inner duct includes a main outlet, and a row of apertures spaced upstream therefrom. The outer duct includes a row of intakes at a forward end, an auxiliary outlet at an aft end, and surrounds t... | 03/14/2006 |
| 6971229 | Confluent exhaust nozzle A gas turbine engine exhaust nozzle includes a nacelle having an inlet and main outlet at opposite ends, and a main duct extending therebetween. A secondary bypass duct extends radially through the nacelle upstream of the main outlet and includes an unobstructed sec... | 12/06/2005 |
| 6973193 | Fan and compressor noise attenuation An exciting sound wave generator is positioned within a nacelle of a jet engine at its inlet to generate an exciting sound wave having a primary frequency generally different from a frequency of the primary tone of the noise. The exciting sound wave is used to modul... | 12/06/2005 |
| 6935098 | Turbomachine nozzle with noise reduction A nozzle comprising an inner barrel, a centerbody disposed inside the inner barrel so as to define a first channel for a primary flow, and an outer barrel surrounding the inner barrel so as to define a second annular channel for a secondary flow, the free end of the... | 08/30/2005 |
| 6901752 | Exhaust processor with variable tuning system and method of operating such exhaust processor An exhaust processor has an exhaust tube and a cover mounted for rotation at least partially around the exhaust tube to adjust the tuning frequency of the exhaust processor. A method of operating the exhaust processor is also disclosed. ... | 06/07/2005 |
| 6896100 | Noise reducing apparatus and exhaust nozzle for jet engine In order to reduce noise effectively and to provide a light-weight noise reducing apparatus and an exhaust nozzle for a jet engine, a mixer for mixing an exhaust gas and an external air is disposed behind an engine, a flow channel for accelerating an exhaust gas tow... | 05/24/2005 |
| 6799423 | Adjustable exhaust system for internal combustion engine The invention is an adjustable exhaust system and an adjustable insert for an exhaust system. The exhaust system includes a header flange, at least one conduit coupled to the header flange, a collector coupled to the conduit, and an adjustable insert for tuning engi... | 10/05/2004 |
| 6705547 | Active noise reducing nozzle A nozzle where the sector into which noise reduction is sought (the direction of populated areas) has a moving lip, driven by actuators in an oscillatory, periodic or sinusoidal motion, around the mid position, to and from the axis, so as to cause the shear layer to... | 03/16/2004 |
| 6427801 | Apparatus for reducing noise in the jet engine A apparatus and method for augmenting the thrust of a jet engine while reducing the noise generated thereby, including extending the thrust reverser sleeve, exposing the cascades while retaining the thrust reverser doors or buckets in their stowed positio... | 08/06/2002 |
| 5941065 | Stowable mixer ejection nozzle An ejector nozzle (10) including an first cowling (12), a second cowling (14), and opposed upright sidewalls (16) that together form an internal nozzle exhaust path is provided. A reconfigurable plug assembly (18) having separable first and second diverte... | 08/24/1999 |
| 5821472 | Supersonic aircraft exhaust noise suppression system A method of reducing noise from a jet engine at a distance D from the engine comprising the step of up-shifting frequencies of noise from the jet engine to higher frequencies to cause increased noise fall-off in the distance D. Where the jet engine has an... | 10/13/1998 |
| 5801341 | Mechanism of noise suppression system for a supersonic aircraft A noise suppression system for a jet engine of an aircraft having a device for blocking a flow of exhaust gases down the exhaust nozzle of the engine, and a device for separating the exhaust gases into a plurality of exhaust streams spaced a predetermined... | 09/01/1998 |
| 5717172 | Sound suppressor exhaust structure A sound suppressor exhaust structure for a jet engine. The exhaust structure has a nozzle body having a generally cylindrical forward intake opening to accommodate an aft end of a jet engine, and a generally quadrilateral aft exit opening. An openable sou... | 02/10/1998 |
| 5517865 | Vortex suppression for an eductor A vortex suppressing flow eductor apparatus having a vortex filament producing flow eductor is provided with corresponding vortex destroying plates positioned and extending sufficiently downstream from a point within educted flow and deep enough into the ... | 05/21/1996 |
| 5402963 | Acoustically shielded exhaust system for high thrust jet engines A flade exhaust nozzle for a high thrust jet engine is configured to form an acoustic shield around the core engine exhaust flowstream while supplementing engine thrust during all flight conditions, particularly during takeoff. The flade airflow is conver... | 04/04/1995 |
| 5078631 | Marine exhaust system A marine exhaust system is provided for separating the gas from the water of gas/water mixture produced by a marine engine, and expelling the gas a sufficient distance from the hull of a boat to place it outside of the turbulent boundary layer surrounding... | 01/07/1992 |
| 5022877 | Marine exhaust system A marine exhaust system is provided for separating the gas from the water of gas/water mixture produced by a marine engine, and expelling the gas a sufficient distance from the hull of a boat to place it outside of the turbulent boundary layer surrounding... | 06/11/1991 |
| 5014933 | Translating lip aircraft cowling structure adapted for noise reduction The present invention comprises a cowling structure for a gas turbine aircraft engine which allows the aerodynamic characteristics of the inlet passageway to the engine to be varied in accordance with flight conditions. This structure includes an annular ... | 05/14/1991 |
| 4934481 | Arrangement for suppressing jet engine noise According to the present invention, there is provided a jet engine comprising a cowl, an exhaust nozzle at the rear of the engine, a plurality of vanes that extend substantially circumferentially around the cowl of the engine in the region of the exhaust ... | 06/19/1990 |
| 4930308 | Double-flow turboshaft engine with variable confluent nozzle This invention relates to a double-flow turboshaft engine with confluent nozzle, i.e. of the type having a central generator emitting via its outlet orifice a flow of hot gas and an annular bypass duct which surrounds the central generator and through whi... | 06/05/1990 |
| 4754924 | Variable geometry nozzle A jet engine nozzle operable in a cruise setting and a noise attenuation setting. In the cruise setting the nozzle provides simple through flow. In the noise attenuation setting some ambient flow is ducted into the through flow and some through flow is du... | 07/05/1988 |
| 4516660 | Ejector and method for controlling jet engine noise An ejector and method of reducing jet engine noise are disclosed wherein the primary combustion gas stream of the jet engine is ejected into a mixing section or zone of the ejector and into which a secondary gas stream is also injected at a velocity suffi... | 05/14/1985 |
| 4501393 | Internally ventilated noise suppressor with large plug nozzle A jet engine noise suppressor particularly adapted for supersonic aircraft. The nozzle (10) has an internal wall surface (70) around a generally centrally positioned body (50) and an annular area (62) extending between the wall and the body. In this area ... | 02/26/1985 |
| 4422524 | Variable shape, fluid flow nozzle for sound suppression The invention is an aircraft jet engine variable shape, fluid flow nozzle (10) which is adjustable to sound-suppression (take-off) and nozzle open (cruise) modes. In the take-off or sound-suppression mode a plurality of movable flaps (24) are positioned i... | 12/27/1983 |
| 4306412 | Jet engine and method of operating the same A jet engine having its turbine section and exhaust nozzles particularly arranged to alleviate noise. There is a forward turbine section positioned in a first passageway to receive all or substantially all of the gaseous discharge from the combustion sect... | 12/22/1981 |
| 4291782 | Simplified method and apparatus for hot-shield jet noise suppression A method and apparatus for selectively generating a noise suppressing hot gas shield are described. A portion of the jet engine exhaust flow is selectively directed to a nozzle which at least partially surrounds the circumference of the jet engine exhaust... | 09/29/1981 |
| 4244294 | Stowable nozzle plug and method for air breathing missile A missile with an air breathing gas turbine propulsion engine configured with a translating exhaust plug nozzle to minimize longitudinal length of the engine section.... | 01/13/1981 |
| 3990530 | Noise suppressor for turbine type power plant A combined ejector and retractable suppressor to suppress jet noise occasioned by the hot gases discharging from the tail pipe of a gas turbine engine has a generally conical shaped duct member defining a primary nozzle coaxially mounted within the ejecto... | 11/09/1976 |
| 3976160 | Device for the attenuation of noise emission by the jet pipes of jet engines A device for the attenuation of the noise emitted by a jet pipe of a jet ine and especially a composite jet pipe of an aircraft jet engine, by pinching of the jet with the aid of opposite panels causing spreading of the jet in one plane, so that a silenc... | 08/24/1976 |
